Monitor an additional area with this add-on wireless sensor that measures ambient temperature and humidity, and water, soil or air temperature with a 6 ft, stainless steel wet probe, * Use probe to monitor an aquarium, terrarium, hot tub, pool or garden, *, Includes one wireless temperature & humidity sensor with 6 ft, detachable stainless steel wet temperature probe (Add up to 5 sensors per gateway, ), Measures ambient air temperature and humidity and probe temperature, 6 ft, detachable wet probe measures temperature of water, soil, air or other wet environments, Sensor LCD toggles temperature and humidity, Wall hanging or free standing weather resistant case, Sensor transmits to gateway in 200 ft, range, Humidity: 3% to 99% (%RH) and Temperature: -40 F to 140 F, 2 AAA Alkaline batteries (not included), Internet and network router required (not included), Length: 6, 25